PictureBox Zoom Problem

[wasishincar]

I'm trying to read a bitmap and zoom in/out it on screen.
I wrote some code but it did not perform as I expect. The bitmap shift
1 pixel to the upper-left coner when zooming in/out button was clicked.
Please kindly help me to check if anything wrong with my code. Many
many thanks.

using System.Drawing;
using System.Drawing. Drawing2D;

// Click Browse to open bitmap file
private void buttonBrowse_Cl ick(object sender, EventArgs e)
{
if (DialogResult.O K ==
this.openFileDi alogBmpLocation .ShowDialog())
{
myBitmap = new
Bitmap(this.ope nFileDialogBmpL ocation.FileNam e);

this.pictureBox Bitmap.Image = myBitmap;
this.pictureBox Bitmap.Size = new Size(myBitmap.W idth,
myBitmap.Height );
}
}

// Click Zoom In to resize the bitmap
private void buttonZoomIn_Cl ick(object sender, EventArgs e)
{
if (this.pictureBo xBitmap.Image == null) return;
Size nSize = new Size( pictureBoxBitma p.Image.Width * 2,
pictureBoxBitma p.Image.Height * 2);
Image gdi = new Bitmap(nSize.Wi dth, nSize.Height);

Graphics ZoomInGraphics = Graphics.FromIm age(gdi);

ZoomInGraphics. InterpolationMo de =
InterpolationMo de.NearestNeigh bor;
ZoomInGraphics. DrawImage(pictu reBoxBitmap.Ima ge, new Rectangle(new
Point(0, 0), nSize), new Rectangle(new Point(0, 0),
pictureBoxBitma p.Image.Size), GraphicsUnit.Pi xel);
ZoomInGraphics. Dispose();

pictureBoxBitma p.Image = gdi;
pictureBoxBitma p.Size = gdi.Size;
}

[chanmm]

Re: PictureBox Zoom Problem

Try this:

http://msdn2.microsoft.com/en-us/library/ms229648.aspx

chanmm

"wasishinca r" <adam.iem92g@gm ail.comwrote in message
news:1161836974 .489598.54250@b 28g2000cwb.goog legroups.com...

I'm trying to read a bitmap and zoom in/out it on screen.
I wrote some code but it did not perform as I expect. The bitmap shift
1 pixel to the upper-left coner when zooming in/out button was clicked.
Please kindly help me to check if anything wrong with my code. Many
many thanks.
>
using System.Drawing;
using System.Drawing. Drawing2D;
>
// Click Browse to open bitmap file
private void buttonBrowse_Cl ick(object sender, EventArgs e)
{
if (DialogResult.O K ==
this.openFileDi alogBmpLocation .ShowDialog())
{
myBitmap = new
Bitmap(this.ope nFileDialogBmpL ocation.FileNam e);
>
this.pictureBox Bitmap.Image = myBitmap;
this.pictureBox Bitmap.Size = new Size(myBitmap.W idth,
myBitmap.Height );
}
}
>
// Click Zoom In to resize the bitmap
private void buttonZoomIn_Cl ick(object sender, EventArgs e)
{
if (this.pictureBo xBitmap.Image == null) return;
Size nSize = new Size( pictureBoxBitma p.Image.Width * 2,
pictureBoxBitma p.Image.Height * 2);
Image gdi = new Bitmap(nSize.Wi dth, nSize.Height);
>
Graphics ZoomInGraphics = Graphics.FromIm age(gdi);
>
ZoomInGraphics. InterpolationMo de =
InterpolationMo de.NearestNeigh bor;
ZoomInGraphics. DrawImage(pictu reBoxBitmap.Ima ge, new Rectangle(new
Point(0, 0), nSize), new Rectangle(new Point(0, 0),
pictureBoxBitma p.Image.Size), GraphicsUnit.Pi xel);
ZoomInGraphics. Dispose();
>
pictureBoxBitma p.Image = gdi;
pictureBoxBitma p.Size = gdi.Size;
}
>

[Alex]

Re: PictureBox Zoom Problem

Why you don't use simple methods?
Bitmap ZoomedBmp = new Bitmap(oldBmp, newWidth, newHeight);

[wasishincar]

Re: PictureBox Zoom Problem

Thank for your reply, but I think there is not much different between
my code and the Microsoft Example. We use the same methed to zoom the
image. I think the problem is from pictureBox. I try to set the padding
and margin to 0, but ths image still shift. Just dont know what's wrong
with the pictureBox. Is anyone know why?

chanmm wrote:

Try this:

http://msdn2.microsoft.com/en-us/library/ms229648.aspx

>
chanmm
>
"wasishinca r" <adam.iem92g@gm ail.comwrote in message
news:1161836974 .489598.54250@b 28g2000cwb.goog legroups.com...

I'm trying to read a bitmap and zoom in/out it on screen.
I wrote some code but it did not perform as I expect. The bitmap shift
1 pixel to the upper-left coner when zooming in/out button was clicked.
Please kindly help me to check if anything wrong with my code. Many
many thanks.

using System.Drawing;
using System.Drawing. Drawing2D;

// Click Browse to open bitmap file
private void buttonBrowse_Cl ick(object sender, EventArgs e)
{
if (DialogResult.O K ==
this.openFileDi alogBmpLocation .ShowDialog())
{
myBitmap = new
Bitmap(this.ope nFileDialogBmpL ocation.FileNam e);

this.pictureBox Bitmap.Image = myBitmap;
this.pictureBox Bitmap.Size = new Size(myBitmap.W idth,
myBitmap.Height );
}
}

// Click Zoom In to resize the bitmap
private void buttonZoomIn_Cl ick(object sender, EventArgs e)
{
if (this.pictureBo xBitmap.Image == null) return;
Size nSize = new Size( pictureBoxBitma p.Image.Width * 2,
pictureBoxBitma p.Image.Height * 2);
Image gdi = new Bitmap(nSize.Wi dth, nSize.Height);

Graphics ZoomInGraphics = Graphics.FromIm age(gdi);

ZoomInGraphics. InterpolationMo de =
InterpolationMo de.NearestNeigh bor;
ZoomInGraphics. DrawImage(pictu reBoxBitmap.Ima ge, new Rectangle(new
Point(0, 0), nSize), new Rectangle(new Point(0, 0),
pictureBoxBitma p.Image.Size), GraphicsUnit.Pi xel);
ZoomInGraphics. Dispose();

pictureBoxBitma p.Image = gdi;
pictureBoxBitma p.Size = gdi.Size;
}

[wasishincar]

Re: PictureBox Zoom Problem

I did not use this cuz I need to zoom it by nearest neighbor.
Thanks for your reply.
Alex wrote:

Why you don't use simple methods?
Bitmap ZoomedBmp = new Bitmap(oldBmp, newWidth, newHeight);